.wrapper {
  position: relative;
  display: inline-block;

  .line {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 999;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    width: 11px;
    height: 100%;
    margin: 0 -5px;
    background-color: #000;
    -moz-background-clip: padding;
    -webkit-background-clip: padding;
    background-clip: padding-box;
    border-right: 5px solid rgba(255, 255, 255, 0);
    border-left: 5px solid rgba(255, 255, 255, 0);
    cursor: col-resize;
    opacity: 0.2;
  }

  .line:hover {
    border-right: 5px solid rgba(0, 0, 0, 0.5);
    border-left: 5px solid rgba(0, 0, 0, 0.5);
    -webkit-transition: all 2s ease;
    transition: all 2s ease;
  }
}
